The RTL-SDR Blog V4 is the latest generation of the popular SDR USB receivers, specifically designed for the needs of radio amateurs and experimenters. Compared to the V3, the V4 version offers improved HF reception technology, optimized filtering, and more efficient power and thermal management.
Reception from 500 kHz to 1.766 GHz
- HF (shortwave): integrated upconverter up to 28.8 MHz
- VHF/UHF: full range of the R828D tuner
Key improvements over V3
- HF reception via upconverter instead of direct sampling: no aliasing issues, improved sensitivity, adjustable HF gain
- Triplexer front-end: separates HF, VHF, and UHF bands for better isolation and reduced interference
- Additional notch filters for AM, FM, and DAB bands to suppress strong broadcast signals
- Improved phase noise performance thanks to optimized power supply design
- Lower heat generation and slightly reduced current draw
Technical data
- Tuner: R828D
- ADC: RTL2832U, 8-bit
- Bandwidth: stable up to 2.56 MHz (up to 3.2 MHz with possible drops)
- Input impedance: 50 Ω
- Current draw: 250–270 mA via USB
- Connectors: SMA socket, USB-A
- Frequency stability: 1 ppm TCXO
- Software-switchable Bias-Tee (4.5 V, 180 mA)
- Rugged aluminum enclosure with thermal coupling
Compatibility
Supports popular SDR software such as SDR#, SDR++, SDR Console V3, GQRX, and many more. Compatible with Windows, Linux, macOS, Android, and single-board computers such as the Raspberry Pi. Up-to-date drivers are required.
Conclusion
The RTL-SDR Blog V4 is a versatile, compact, and powerful SDR receiver. With its new HF upconverter, improved filtering, and optimized noise performance, it represents a clear advancement over the V3 version – ideal for both beginners and experienced SDR users alike.
